Need Help!- Stand alone encoder controlled stepper driver

[JWWalthall]

Can anyone tell me if there is stepper driver out there that is a stand alone unit that uses a encoder for controlling the stepper motor. I also need it to be switchable from full step to half and quarter step via a rotary switch. I need this for a positioning system that I am designing. Is there anyone out there that has built a encoder interface for a standard bipolar stepper driver.

Thanks !

[JWWalthall]

I realized that I stated in my post that I wanted to control the driver with an encoder . I probably needed to say a manual pulse generator . Sorry for the wrong terminology.

[jschmitt]

I saw this site for a telescope stepper drive with key pad for control
http://www.atmsite.org/contrib/Rowe/dastep/dastep.html

[JWWalthall]

Thanks JSchmitt for the info I will check it out.

[jschmitt]

on larger machines we use something on this order:
http://rogersmachine.net/MPG/heatsink.html
pretty pricey

I saw something on this forum 1-2yrs back about using 555 timers and dual pots to generate pulses to a stepper drive.